Rangers have launched an investigation after a social media video showed fans allegedly chanting a racist song about Celtic's Japanese forward Kyogo Furuhashi.
The footage, from what looks like a supporters' bus, emerged on Sunday afternoon, when the Light Blues were in Dingwall for a 4-2 win over Ross County.
In response, a club spokesperson said: "Rangers condemns all forms of racism and discrimination.
"Those who partake in such behaviour are not representative of our club or the loyal support who have stood by us through thick and thin.
"We are currently investigating to identify the individuals involved."
Furuhashi, 26, joined Celtic from Vissel Kobe this summer and has become an immediate favourite at Parkhead with six goals in seven games.